From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753458Ab2GQHFu (ORCPT ); Tue, 17 Jul 2012 03:05:50 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:39453 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751828Ab2GQHFn (ORCPT ); Tue, 17 Jul 2012 03:05:43 -0400 From: John Stultz To: stable@vger.kernel.org Cc: Richard Cochran , Prarit Bhargava , Thomas Gleixner , Linux Kernel , John Stultz Subject: [PATCH 02/11] 3.2.x: ntp: Correct TAI offset during leap second Date: Tue, 17 Jul 2012 03:05:15 -0400 Message-Id: <1342508724-14527-3-git-send-email-johnstul@us.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1342508724-14527-1-git-send-email-johnstul@us.ibm.com> References: <1342508724-14527-1-git-send-email-johnstul@us.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12071707-7182-0000-0000-000001FFF2AA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Richard Cochran This is a backport of dd48d708ff3e917f6d6b6c2b696c3f18c019feed When repeating a UTC time value during a leap second (when the UTC time should be 23:59:60), the TAI timescale should not stop. The kernel NTP code increments the TAI offset one second too late. This patch fixes the issue by incrementing the offset during the leap second itself. Signed-off-by: Richard Cochran Cc: Prarit Bhargava Cc: Thomas Gleixner Cc: Linux Kernel Signed-off-by: John Stultz --- kernel/time/ntp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 4508f7f..f1eb182 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -378,6 +378,7 @@ int second_overflow(unsigned long secs) if (secs % 86400 == 0) { leap = -1; time_state = TIME_OOP; + time_tai++; printk(KERN_NOTICE "Clock: inserting leap second 23:59:60 UTC\n"); } @@ -392,7 +393,6 @@ int second_overflow(unsigned long secs) } break; case TIME_OOP: - time_tai++; time_state = TIME_WAIT; break; -- 1.7.9.5